0. partykit: Recursive Partytioning Toolkit- Infrastructure for representing, summarizing, and visualizing tree-structured models. It can be used for constructing or reading tree models from different sources (rpart, RWeka, PMML), sharing
functionality for print/plot/predict methods.

2. simecol - Ecological Models with R- simecol allows to implement ecological models (ODEs, IBMs, ...) using a template-like object-oriented stucture. It helps to organize scenarios and may also be useful for other areas.

5. optparse, argparse: command line parsers- Development of getopt, optparse, and argparse has moved to Github. Try out http://www.github.com/trevorld/argparse, http://www.github.com/trevorld/optparse, or http://www.github.com/trevorld/getopt .

10. rPithon: use Python over a 'pipe'- rPithon is based on rPython but instead of linking to the Python libraries, a Python program is started and is communicated with using a 'pipe'. This allows different R programs/packages to use different Python instances if desired.

14. scimapClient- This package sends anonymized package usage information to http://scisoft-net-map.isri.cmu.edu. You can help the creators of scientific software packages show the usage and impact of their software to employers, funding agencies, tenure committees, etc.